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ffmpeg / libavformat / matroskaenc.c @ 690b4126

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1
/*
2
 * Matroska muxer
3
 * Copyright (c) 2007 David Conrad
4
 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
#include "avformat.h"
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#include "riff.h"
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#include "isom.h"
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#include "matroska.h"
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#include "avc.h"
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#include "flacenc.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/md5.h"
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#include "libavcodec/xiph.h"
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#include "libavcodec/mpeg4audio.h"
32

    
33
typedef struct ebml_master {
34
    int64_t         pos;                ///< absolute offset in the file where the master's elements start
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    int             sizebytes;          ///< how many bytes were reserved for the size
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} ebml_master;
37

    
38
typedef struct mkv_seekhead_entry {
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    unsigned int    elementid;
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    uint64_t        segmentpos;
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} mkv_seekhead_entry;
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43
typedef struct mkv_seekhead {
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    int64_t                 filepos;
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    int64_t                 segment_offset;     ///< the file offset to the beginning of the segment
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    int                     reserved_size;      ///< -1 if appending to file
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    int                     max_entries;
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    mkv_seekhead_entry      *entries;
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    int                     num_entries;
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} mkv_seekhead;
51

    
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typedef struct {
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    uint64_t        pts;
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    int             tracknum;
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    int64_t         cluster_pos;        ///< file offset of the cluster containing the block
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} mkv_cuepoint;
57

    
58
typedef struct {
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    int64_t         segment_offset;
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    mkv_cuepoint    *entries;
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    int             num_entries;
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} mkv_cues;
63

    
64
typedef struct MatroskaMuxContext {
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    ebml_master     segment;
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    int64_t         segment_offset;
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    int64_t         segment_uid;
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    ebml_master     cluster;
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    int64_t         cluster_pos;        ///< file offset of the current cluster
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    uint64_t        cluster_pts;
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    int64_t         duration_offset;
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    uint64_t        duration;
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    mkv_seekhead    *main_seekhead;
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    mkv_seekhead    *cluster_seekhead;
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    mkv_cues        *cues;
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77
    struct AVMD5    *md5_ctx;
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} MatroskaMuxContext;
79

    
80

    
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/** 2 bytes * 3 for EBML IDs, 3 1-byte EBML lengths, 8 bytes for 64 bit
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 * offset, 4 bytes for target EBML ID */
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#define MAX_SEEKENTRY_SIZE 21
84

    
85
/** per-cuepoint-track - 3 1-byte EBML IDs, 3 1-byte EBML sizes, 2
86
 * 8-byte uint max */
87
#define MAX_CUETRACKPOS_SIZE 22
88

    
89
/** per-cuepoint - 2 1-byte EBML IDs, 2 1-byte EBML sizes, 8-byte uint max */
90
#define MAX_CUEPOINT_SIZE(num_tracks) 12 + MAX_CUETRACKPOS_SIZE*num_tracks
91

    
92

    
93
static int ebml_id_size(unsigned int id)
94
{
95
    return (av_log2(id+1)-1)/7+1;
96
}
97

    
98
static void put_ebml_id(ByteIOContext *pb, unsigned int id)
99
{
100
    int i = ebml_id_size(id);
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    while (i--)
102
        put_byte(pb, id >> (i*8));
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}
104

    
105
/**
106
 * Write an EBML size meaning "unknown size".
107
 *
108
 * @param bytes The number of bytes the size should occupy (maximum: 8).
109
 */
110
static void put_ebml_size_unknown(ByteIOContext *pb, int bytes)
111
{
112
    assert(bytes <= 8);
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    put_byte(pb, 0x1ff >> bytes);
114
    while (--bytes)
115
        put_byte(pb, 0xff);
116
}
117

    
118
/**
119
 * Calculate how many bytes are needed to represent a given number in EBML.
120
 */
121
static int ebml_num_size(uint64_t num)
122
{
123
    int bytes = 1;
124
    while ((num+1) >> bytes*7) bytes++;
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    return bytes;
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}
127

    
128
/**
129
 * Write a number in EBML variable length format.
130
 *
131
 * @param bytes The number of bytes that need to be used to write the number.
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 *              If zero, any number of bytes can be used.
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 */
134
static void put_ebml_num(ByteIOContext *pb, uint64_t num, int bytes)
135
{
136
    int i, needed_bytes = ebml_num_size(num);
137

    
138
    // sizes larger than this are currently undefined in EBML
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    assert(num < (1ULL<<56)-1);
140

    
141
    if (bytes == 0)
142
        // don't care how many bytes are used, so use the min
143
        bytes = needed_bytes;
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    // the bytes needed to write the given size would exceed the bytes
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    // that we need to use, so write unknown size. This shouldn't happen.
146
    assert(bytes >= needed_bytes);
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148
    num |= 1ULL << bytes*7;
149
    for (i = bytes - 1; i >= 0; i--)
150
        put_byte(pb, num >> i*8);
151
}
152

    
153
static void put_ebml_uint(ByteIOContext *pb, unsigned int elementid, uint64_t val)
154
{
155
    int i, bytes = 1;
156
    uint64_t tmp = val;
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    while (tmp>>=8) bytes++;
158

    
159
    put_ebml_id(pb, elementid);
160
    put_ebml_num(pb, bytes, 0);
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    for (i = bytes - 1; i >= 0; i--)
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        put_byte(pb, val >> i*8);
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}
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165
static void put_ebml_float(ByteIOContext *pb, unsigned int elementid, double val)
166
{
167
    put_ebml_id(pb, elementid);
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    put_ebml_num(pb, 8, 0);
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    put_be64(pb, av_dbl2int(val));
170
}
171

    
172
static void put_ebml_binary(ByteIOContext *pb, unsigned int elementid,
173
                            const uint8_t *buf, int size)
174
{
175
    put_ebml_id(pb, elementid);
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    put_ebml_num(pb, size, 0);
177
    put_buffer(pb, buf, size);
178
}
179

    
180
static void put_ebml_string(ByteIOContext *pb, unsigned int elementid, const char *str)
181
{
182
    put_ebml_binary(pb, elementid, str, strlen(str));
183
}
184

    
185
/**
186
 * Writes a void element of a given size. Useful for reserving space in
187
 * the file to be written to later.
188
 *
189
 * @param size The number of bytes to reserve, which must be at least 2.
190
 */
191
static void put_ebml_void(ByteIOContext *pb, uint64_t size)
192
{
193
    int64_t currentpos = url_ftell(pb);
194

    
195
    assert(size >= 2);
196

    
197
    put_ebml_id(pb, EBML_ID_VOID);
198
    // we need to subtract the length needed to store the size from the
199
    // size we need to reserve so 2 cases, we use 8 bytes to store the
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    // size if possible, 1 byte otherwise
201
    if (size < 10)
202
        put_ebml_num(pb, size-1, 0);
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    else
204
        put_ebml_num(pb, size-9, 8);
205
    while(url_ftell(pb) < currentpos + size)
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        put_byte(pb, 0);
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}
208

    
209
static ebml_master start_ebml_master(ByteIOContext *pb, unsigned int elementid, uint64_t expectedsize)
210
{
211
    int bytes = expectedsize ? ebml_num_size(expectedsize) : 8;
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    put_ebml_id(pb, elementid);
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    put_ebml_size_unknown(pb, bytes);
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    return (ebml_master){ url_ftell(pb), bytes };
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}
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static void end_ebml_master(ByteIOContext *pb, ebml_master master)
218
{
219
    int64_t pos = url_ftell(pb);
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    // leave the unknown size for masters when streaming
222
    if (url_is_streamed(pb))
223
        return;
224

    
225
    url_fseek(pb, master.pos - master.sizebytes, SEEK_SET);
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    put_ebml_num(pb, pos - master.pos, master.sizebytes);
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    url_fseek(pb, pos, SEEK_SET);
228
}
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230
static void put_xiph_size(ByteIOContext *pb, int size)
231
{
232
    int i;
233
    for (i = 0; i < size / 255; i++)
234
        put_byte(pb, 255);
235
    put_byte(pb, size % 255);
236
}
237

    
238
/**
239
 * Initialize a mkv_seekhead element to be ready to index level 1 Matroska
240
 * elements. If a maximum number of elements is specified, enough space
241
 * will be reserved at the current file location to write a seek head of
242
 * that size.
243
 *
244
 * @param segment_offset The absolute offset to the position in the file
245
 *                       where the segment begins.
246
 * @param numelements The maximum number of elements that will be indexed
247
 *                    by this seek head, 0 if unlimited.
248
 */
249
static mkv_seekhead * mkv_start_seekhead(ByteIOContext *pb, int64_t segment_offset, int numelements)
250
{
251
    mkv_seekhead *new_seekhead = av_mallocz(sizeof(mkv_seekhead));
252
    if (new_seekhead == NULL)
253
        return NULL;
254

    
255
    new_seekhead->segment_offset = segment_offset;
256

    
257
    if (numelements > 0) {
258
        new_seekhead->filepos = url_ftell(pb);
259
        // 21 bytes max for a seek entry, 10 bytes max for the SeekHead ID
260
        // and size, and 3 bytes to guarantee that an EBML void element
261
        // will fit afterwards
262
        new_seekhead->reserved_size = numelements * MAX_SEEKENTRY_SIZE + 13;
263
        new_seekhead->max_entries = numelements;
264
        put_ebml_void(pb, new_seekhead->reserved_size);
265
    }
266
    return new_seekhead;
267
}
268

    
269
static int mkv_add_seekhead_entry(mkv_seekhead *seekhead, unsigned int elementid, uint64_t filepos)
270
{
271
    mkv_seekhead_entry *entries = seekhead->entries;
272

    
273
    // don't store more elements than we reserved space for
274
    if (seekhead->max_entries > 0 && seekhead->max_entries <= seekhead->num_entries)
275
        return -1;
276

    
277
    entries = av_realloc(entries, (seekhead->num_entries + 1) * sizeof(mkv_seekhead_entry));
278
    if (entries == NULL)
279
        return AVERROR(ENOMEM);
280

    
281
    entries[seekhead->num_entries  ].elementid = elementid;
282
    entries[seekhead->num_entries++].segmentpos = filepos - seekhead->segment_offset;
283

    
284
    seekhead->entries = entries;
285
    return 0;
286
}
287

    
288
/**
289
 * Write the seek head to the file and free it. If a maximum number of
290
 * elements was specified to mkv_start_seekhead(), the seek head will
291
 * be written at the location reserved for it. Otherwise, it is written
292
 * at the current location in the file.
293
 *
294
 * @return The file offset where the seekhead was written.
295
 */
296
static int64_t mkv_write_seekhead(ByteIOContext *pb, mkv_seekhead *seekhead)
297
{
298
    ebml_master metaseek, seekentry;
299
    int64_t currentpos;
300
    int i;
301

    
302
    currentpos = url_ftell(pb);
303

    
304
    if (seekhead->reserved_size > 0)
305
        url_fseek(pb, seekhead->filepos, SEEK_SET);
306

    
307
    metaseek = start_ebml_master(pb, MATROSKA_ID_SEEKHEAD, seekhead->reserved_size);
308
    for (i = 0; i < seekhead->num_entries; i++) {
309
        mkv_seekhead_entry *entry = &seekhead->entries[i];
310

    
311
        seekentry = start_ebml_master(pb, MATROSKA_ID_SEEKENTRY, MAX_SEEKENTRY_SIZE);
312

    
313
        put_ebml_id(pb, MATROSKA_ID_SEEKID);
314
        put_ebml_num(pb, ebml_id_size(entry->elementid), 0);
315
        put_ebml_id(pb, entry->elementid);
316

    
317
        put_ebml_uint(pb, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
318
        end_ebml_master(pb, seekentry);
319
    }
320
    end_ebml_master(pb, metaseek);
321

    
322
    if (seekhead->reserved_size > 0) {
323
        uint64_t remaining = seekhead->filepos + seekhead->reserved_size - url_ftell(pb);
324
        put_ebml_void(pb, remaining);
325
        url_fseek(pb, currentpos, SEEK_SET);
326

    
327
        currentpos = seekhead->filepos;
328
    }
329
    av_free(seekhead->entries);
330
    av_free(seekhead);
331

    
332
    return currentpos;
333
}
334

    
335
static mkv_cues * mkv_start_cues(int64_t segment_offset)
336
{
337
    mkv_cues *cues = av_mallocz(sizeof(mkv_cues));
338
    if (cues == NULL)
339
        return NULL;
340

    
341
    cues->segment_offset = segment_offset;
342
    return cues;
343
}
344

    
345
static int mkv_add_cuepoint(mkv_cues *cues, AVPacket *pkt, int64_t cluster_pos)
346
{
347
    mkv_cuepoint *entries = cues->entries;
348

    
349
    entries = av_realloc(entries, (cues->num_entries + 1) * sizeof(mkv_cuepoint));
350
    if (entries == NULL)
351
        return AVERROR(ENOMEM);
352

    
353
    entries[cues->num_entries  ].pts = pkt->pts;
354
    entries[cues->num_entries  ].tracknum = pkt->stream_index + 1;
355
    entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
356

    
357
    cues->entries = entries;
358
    return 0;
359
}
360

    
361
static int64_t mkv_write_cues(ByteIOContext *pb, mkv_cues *cues, int num_tracks)
362
{
363
    ebml_master cues_element;
364
    int64_t currentpos;
365
    int i, j;
366

    
367
    currentpos = url_ftell(pb);
368
    cues_element = start_ebml_master(pb, MATROSKA_ID_CUES, 0);
369

    
370
    for (i = 0; i < cues->num_entries; i++) {
371
        ebml_master cuepoint, track_positions;
372
        mkv_cuepoint *entry = &cues->entries[i];
373
        uint64_t pts = entry->pts;
374

    
375
        cuepoint = start_ebml_master(pb, MATROSKA_ID_POINTENTRY, MAX_CUEPOINT_SIZE(num_tracks));
376
        put_ebml_uint(pb, MATROSKA_ID_CUETIME, pts);
377

    
378
        // put all the entries from different tracks that have the exact same
379
        // timestamp into the same CuePoint
380
        for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
381
            track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
382
            put_ebml_uint(pb, MATROSKA_ID_CUETRACK          , entry[j].tracknum   );
383
            put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);
384
            end_ebml_master(pb, track_positions);
385
        }
386
        i += j - 1;
387
        end_ebml_master(pb, cuepoint);
388
    }
389
    end_ebml_master(pb, cues_element);
390

    
391
    av_free(cues->entries);
392
    av_free(cues);
393
    return currentpos;
394
}
395

    
396
static int put_xiph_codecpriv(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec)
397
{
398
    uint8_t *header_start[3];
399
    int header_len[3];
400
    int first_header_size;
401
    int j;
402

    
403
    if (codec->codec_id == CODEC_ID_VORBIS)
404
        first_header_size = 30;
405
    else
406
        first_header_size = 42;
407

    
408
    if (ff_split_xiph_headers(codec->extradata, codec->extradata_size,
409
                              first_header_size, header_start, header_len) < 0) {
410
        av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
411
        return -1;
412
    }
413

    
414
    put_byte(pb, 2);                    // number packets - 1
415
    for (j = 0; j < 2; j++) {
416
        put_xiph_size(pb, header_len[j]);
417
    }
418
    for (j = 0; j < 3; j++)
419
        put_buffer(pb, header_start[j], header_len[j]);
420

    
421
    return 0;
422
}
423

    
424
static void get_aac_sample_rates(AVFormatContext *s, AVCodecContext *codec, int *sample_rate, int *output_sample_rate)
425
{
426
    int sri;
427

    
428
    if (codec->extradata_size < 2) {
429
        av_log(s, AV_LOG_WARNING, "No AAC extradata, unable to determine samplerate.\n");
430
        return;
431
    }
432

    
433
    sri = ((codec->extradata[0] << 1) & 0xE) | (codec->extradata[1] >> 7);
434
    if (sri > 12) {
435
        av_log(s, AV_LOG_WARNING, "AAC samplerate index out of bounds\n");
436
        return;
437
    }
438
    *sample_rate = ff_mpeg4audio_sample_rates[sri];
439

    
440
    // if sbr, get output sample rate as well
441
    if (codec->extradata_size == 5) {
442
        sri = (codec->extradata[4] >> 3) & 0xF;
443
        if (sri > 12) {
444
            av_log(s, AV_LOG_WARNING, "AAC output samplerate index out of bounds\n");
445
            return;
446
        }
447
        *output_sample_rate = ff_mpeg4audio_sample_rates[sri];
448
    }
449
}
450

    
451
static int mkv_write_codecprivate(AVFormatContext *s, ByteIOContext *pb, AVCodecContext *codec, int native_id, int qt_id)
452
{
453
    ByteIOContext *dyn_cp;
454
    uint8_t *codecpriv;
455
    int ret, codecpriv_size;
456

    
457
    ret = url_open_dyn_buf(&dyn_cp);
458
    if(ret < 0)
459
        return ret;
460

    
461
    if (native_id) {
462
        if (codec->codec_id == CODEC_ID_VORBIS || codec->codec_id == CODEC_ID_THEORA)
463
            ret = put_xiph_codecpriv(s, dyn_cp, codec);
464
        else if (codec->codec_id == CODEC_ID_FLAC)
465
            ret = ff_flac_write_header(dyn_cp, codec);
466
        else if (codec->codec_id == CODEC_ID_H264)
467
            ret = ff_isom_write_avcc(dyn_cp, codec->extradata, codec->extradata_size);
468
        else if (codec->extradata_size)
469
            put_buffer(dyn_cp, codec->extradata, codec->extradata_size);
470
    } else if (codec->codec_type == CODEC_TYPE_VIDEO) {
471
        if (qt_id) {
472
            if (!codec->codec_tag)
473
                codec->codec_tag = ff_codec_get_tag(codec_movvideo_tags, codec->codec_id);
474
            if (codec->extradata_size)
475
                put_buffer(dyn_cp, codec->extradata, codec->extradata_size);
476
        } else {
477
        if (!codec->codec_tag)
478
            codec->codec_tag = ff_codec_get_tag(ff_codec_bmp_tags, codec->codec_id);
479
        if (!codec->codec_tag) {
480
            av_log(s, AV_LOG_ERROR, "No bmp codec ID found.");
481
            ret = -1;
482
        }
483

    
484
        ff_put_bmp_header(dyn_cp, codec, ff_codec_bmp_tags, 0);
485
        }
486

    
487
    } else if (codec->codec_type == CODEC_TYPE_AUDIO) {
488
        if (!codec->codec_tag)
489
            codec->codec_tag = ff_codec_get_tag(ff_codec_wav_tags, codec->codec_id);
490
        if (!codec->codec_tag) {
491
            av_log(s, AV_LOG_ERROR, "No wav codec ID found.");
492
            ret = -1;
493
        }
494

    
495
        ff_put_wav_header(dyn_cp, codec);
496
    }
497

    
498
    codecpriv_size = url_close_dyn_buf(dyn_cp, &codecpriv);
499
    if (codecpriv_size)
500
        put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
501
    av_free(codecpriv);
502
    return ret;
503
}
504

    
505
static int mkv_write_tracks(AVFormatContext *s)
506
{
507
    MatroskaMuxContext *mkv = s->priv_data;
508
    ByteIOContext *pb = s->pb;
509
    ebml_master tracks;
510
    int i, j, ret;
511

    
512
    ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, url_ftell(pb));
513
    if (ret < 0) return ret;
514

    
515
    tracks = start_ebml_master(pb, MATROSKA_ID_TRACKS, 0);
516
    for (i = 0; i < s->nb_streams; i++) {
517
        AVStream *st = s->streams[i];
518
        AVCodecContext *codec = st->codec;
519
        ebml_master subinfo, track;
520
        int native_id = 0;
521
        int qt_id = 0;
522
        int bit_depth = av_get_bits_per_sample(codec->codec_id);
523
        int sample_rate = codec->sample_rate;
524
        int output_sample_rate = 0;
525
        AVMetadataTag *tag;
526

    
527
        if (!bit_depth)
528
            bit_depth = av_get_bits_per_sample_format(codec->sample_fmt);
529

    
530
        if (codec->codec_id == CODEC_ID_AAC)
531
            get_aac_sample_rates(s, codec, &sample_rate, &output_sample_rate);
532

    
533
        track = start_ebml_master(pb, MATROSKA_ID_TRACKENTRY, 0);
534
        put_ebml_uint (pb, MATROSKA_ID_TRACKNUMBER     , i + 1);
535
        put_ebml_uint (pb, MATROSKA_ID_TRACKUID        , i + 1);
536
        put_ebml_uint (pb, MATROSKA_ID_TRACKFLAGLACING , 0);    // no lacing (yet)
537
        put_ebml_float(pb, MATROSKA_ID_TRACKTIMECODESCALE, 1.0);
538

    
539
        if ((tag = av_metadata_get(st->metadata, "title", NULL, 0)))
540
            put_ebml_string(pb, MATROSKA_ID_TRACKNAME, tag->value);
541
        tag = av_metadata_get(st->metadata, "language", NULL, 0);
542
        put_ebml_string(pb, MATROSKA_ID_TRACKLANGUAGE, tag ? tag->value:"und");
543

    
544
        if (st->disposition)
545
            put_ebml_uint(pb, MATROSKA_ID_TRACKFLAGDEFAULT, !!(st->disposition & AV_DISPOSITION_DEFAULT));
546

    
547
        // look for a codec ID string specific to mkv to use,
548
        // if none are found, use AVI codes
549
        for (j = 0; ff_mkv_codec_tags[j].id != CODEC_ID_NONE; j++) {
550
            if (ff_mkv_codec_tags[j].id == codec->codec_id) {
551
                put_ebml_string(pb, MATROSKA_ID_CODECID, ff_mkv_codec_tags[j].str);
552
                native_id = 1;
553
                break;
554
            }
555
        }
556

    
557
        switch (codec->codec_type) {
558
            case CODEC_TYPE_VIDEO:
559
                put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
560

    
561
                if (!native_id &&
562
                      ff_codec_get_tag(codec_movvideo_tags, codec->codec_id) &&
563
                    (!ff_codec_get_tag(ff_codec_bmp_tags,   codec->codec_id)
564
                     || codec->codec_id == CODEC_ID_SVQ1
565
                     || codec->codec_id == CODEC_ID_SVQ3
566
                     || codec->codec_id == CODEC_ID_CINEPAK))
567
                    qt_id = 1;
568

    
569
                if (qt_id)
570
                    put_ebml_string(pb, MATROSKA_ID_CODECID, "V_QUICKTIME");
571
                else if (!native_id)
572
                    // if there is no mkv-specific codec ID, use VFW mode
573
                    put_ebml_string(pb, MATROSKA_ID_CODECID, "V_MS/VFW/FOURCC");
574

    
575
                subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKVIDEO, 0);
576
                // XXX: interlace flag?
577
                put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELWIDTH , codec->width);
578
                put_ebml_uint (pb, MATROSKA_ID_VIDEOPIXELHEIGHT, codec->height);
579
                if (st->sample_aspect_ratio.num) {
580
                    int d_width = codec->width*av_q2d(st->sample_aspect_ratio);
581
                    put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYWIDTH , d_width);
582
                    put_ebml_uint(pb, MATROSKA_ID_VIDEODISPLAYHEIGHT, codec->height);
583
                }
584
                end_ebml_master(pb, subinfo);
585
                break;
586

    
587
            case CODEC_TYPE_AUDIO:
588
                put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_AUDIO);
589

    
590
                if (!native_id)
591
                    // no mkv-specific ID, use ACM mode
592
                    put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
593

    
594
                subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
595
                put_ebml_uint  (pb, MATROSKA_ID_AUDIOCHANNELS    , codec->channels);
596
                put_ebml_float (pb, MATROSKA_ID_AUDIOSAMPLINGFREQ, sample_rate);
597
                if (output_sample_rate)
598
                    put_ebml_float(pb, MATROSKA_ID_AUDIOOUTSAMPLINGFREQ, output_sample_rate);
599
                if (bit_depth)
600
                    put_ebml_uint(pb, MATROSKA_ID_AUDIOBITDEPTH, bit_depth);
601
                end_ebml_master(pb, subinfo);
602
                break;
603

    
604
            case CODEC_TYPE_SUBTITLE:
605
                put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_SUBTITLE);
606
                break;
607
            default:
608
                av_log(s, AV_LOG_ERROR, "Only audio, video, and subtitles are supported for Matroska.");
609
                break;
610
        }
611
        ret = mkv_write_codecprivate(s, pb, codec, native_id, qt_id);
612
        if (ret < 0) return ret;
613

    
614
        end_ebml_master(pb, track);
615

    
616
        // ms precision is the de-facto standard timescale for mkv files
617
        av_set_pts_info(st, 64, 1, 1000);
618
    }
619
    end_ebml_master(pb, tracks);
620
    return 0;
621
}
622

    
623
static int mkv_write_chapters(AVFormatContext *s)
624
{
625
    MatroskaMuxContext *mkv = s->priv_data;
626
    ByteIOContext *pb = s->pb;
627
    ebml_master chapters, editionentry;
628
    AVRational scale = {1, 1E9};
629
    int i, ret;
630

    
631
    if (!s->nb_chapters)
632
        return 0;
633

    
634
    ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CHAPTERS, url_ftell(pb));
635
    if (ret < 0) return ret;
636

    
637
    chapters     = start_ebml_master(pb, MATROSKA_ID_CHAPTERS    , 0);
638
    editionentry = start_ebml_master(pb, MATROSKA_ID_EDITIONENTRY, 0);
639
    put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGDEFAULT, 1);
640
    put_ebml_uint(pb, MATROSKA_ID_EDITIONFLAGHIDDEN , 0);
641
    for (i = 0; i < s->nb_chapters; i++) {
642
        ebml_master chapteratom, chapterdisplay;
643
        AVChapter *c     = s->chapters[i];
644
        AVMetadataTag *t = NULL;
645

    
646
        chapteratom = start_ebml_master(pb, MATROSKA_ID_CHAPTERATOM, 0);
647
        put_ebml_uint(pb, MATROSKA_ID_CHAPTERUID, c->id);
648
        put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMESTART,
649
                      av_rescale_q(c->start, c->time_base, scale));
650
        put_ebml_uint(pb, MATROSKA_ID_CHAPTERTIMEEND,
651
                      av_rescale_q(c->end,   c->time_base, scale));
652
        put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGHIDDEN , 0);
653
        put_ebml_uint(pb, MATROSKA_ID_CHAPTERFLAGENABLED, 1);
654
        if ((t = av_metadata_get(c->metadata, "title", NULL, 0))) {
655
            chapterdisplay = start_ebml_master(pb, MATROSKA_ID_CHAPTERDISPLAY, 0);
656
            put_ebml_string(pb, MATROSKA_ID_CHAPSTRING, t->value);
657
            put_ebml_string(pb, MATROSKA_ID_CHAPLANG  , "und");
658
            end_ebml_master(pb, chapterdisplay);
659
        }
660
        end_ebml_master(pb, chapteratom);
661
    }
662
    end_ebml_master(pb, editionentry);
663
    end_ebml_master(pb, chapters);
664
    return 0;
665
}
666

    
667
static int mkv_write_header(AVFormatContext *s)
668
{
669
    MatroskaMuxContext *mkv = s->priv_data;
670
    ByteIOContext *pb = s->pb;
671
    ebml_master ebml_header, segment_info;
672
    AVMetadataTag *tag;
673
    int ret;
674

    
675
    mkv->md5_ctx = av_mallocz(av_md5_size);
676
    av_md5_init(mkv->md5_ctx);
677

    
678
    ebml_header = start_ebml_master(pb, EBML_ID_HEADER, 0);
679
    put_ebml_uint   (pb, EBML_ID_EBMLVERSION        ,           1);
680
    put_ebml_uint   (pb, EBML_ID_EBMLREADVERSION    ,           1);
681
    put_ebml_uint   (pb, EBML_ID_EBMLMAXIDLENGTH    ,           4);
682
    put_ebml_uint   (pb, EBML_ID_EBMLMAXSIZELENGTH  ,           8);
683
    put_ebml_string (pb, EBML_ID_DOCTYPE            ,  "matroska");
684
    put_ebml_uint   (pb, EBML_ID_DOCTYPEVERSION     ,           2);
685
    put_ebml_uint   (pb, EBML_ID_DOCTYPEREADVERSION ,           2);
686
    end_ebml_master(pb, ebml_header);
687

    
688
    mkv->segment = start_ebml_master(pb, MATROSKA_ID_SEGMENT, 0);
689
    mkv->segment_offset = url_ftell(pb);
690

    
691
    // we write 2 seek heads - one at the end of the file to point to each
692
    // cluster, and one at the beginning to point to all other level one
693
    // elements (including the seek head at the end of the file), which
694
    // isn't more than 10 elements if we only write one of each other
695
    // currently defined level 1 element
696
    mkv->main_seekhead    = mkv_start_seekhead(pb, mkv->segment_offset, 10);
697
    mkv->cluster_seekhead = mkv_start_seekhead(pb, mkv->segment_offset, 0);
698
    if (mkv->main_seekhead == NULL || mkv->cluster_seekhead == NULL)
699
        return AVERROR(ENOMEM);
700

    
701
    ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_INFO, url_ftell(pb));
702
    if (ret < 0) return ret;
703

    
704
    segment_info = start_ebml_master(pb, MATROSKA_ID_INFO, 0);
705
    put_ebml_uint(pb, MATROSKA_ID_TIMECODESCALE, 1000000);
706
    if ((tag = av_metadata_get(s->metadata, "title", NULL, 0)))
707
        put_ebml_string(pb, MATROSKA_ID_TITLE, tag->value);
708
    if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
709
        put_ebml_string(pb, MATROSKA_ID_MUXINGAPP , LIBAVFORMAT_IDENT);
710
        put_ebml_string(pb, MATROSKA_ID_WRITINGAPP, LIBAVFORMAT_IDENT);
711

    
712
        // reserve space to write the segment UID later
713
        mkv->segment_uid = url_ftell(pb);
714
        put_ebml_void(pb, 19);
715
    }
716

    
717
    // reserve space for the duration
718
    mkv->duration = 0;
719
    mkv->duration_offset = url_ftell(pb);
720
    put_ebml_void(pb, 11);                  // assumes double-precision float to be written
721
    end_ebml_master(pb, segment_info);
722

    
723
    ret = mkv_write_tracks(s);
724
    if (ret < 0) return ret;
725

    
726
    ret = mkv_write_chapters(s);
727
    if (ret < 0) return ret;
728

    
729
    ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
730
    if (ret < 0) return ret;
731

    
732
    mkv->cluster_pos = url_ftell(pb);
733
    mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
734
    put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, 0);
735
    mkv->cluster_pts = 0;
736

    
737
    mkv->cues = mkv_start_cues(mkv->segment_offset);
738
    if (mkv->cues == NULL)
739
        return AVERROR(ENOMEM);
740

    
741
    put_flush_packet(pb);
742
    return 0;
743
}
744

    
745
static int mkv_blockgroup_size(int pkt_size)
746
{
747
    int size = pkt_size + 4;
748
    size += ebml_num_size(size);
749
    size += 2;              // EBML ID for block and block duration
750
    size += 8;              // max size of block duration
751
    size += ebml_num_size(size);
752
    size += 1;              // blockgroup EBML ID
753
    return size;
754
}
755

    
756
static int ass_get_duration(const uint8_t *p)
757
{
758
    int sh, sm, ss, sc, eh, em, es, ec;
759
    uint64_t start, end;
760

    
761
    if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
762
               &sh, &sm, &ss, &sc, &eh, &em, &es, &ec) != 8)
763
        return 0;
764
    start = 3600000*sh + 60000*sm + 1000*ss + 10*sc;
765
    end   = 3600000*eh + 60000*em + 1000*es + 10*ec;
766
    return end - start;
767
}
768

    
769
static int mkv_write_ass_blocks(AVFormatContext *s, AVPacket *pkt)
770
{
771
    MatroskaMuxContext *mkv = s->priv_data;
772
    ByteIOContext *pb = s->pb;
773
    int i, layer = 0, max_duration = 0, size, line_size, data_size = pkt->size;
774
    uint8_t *start, *end, *data = pkt->data;
775
    ebml_master blockgroup;
776
    char buffer[2048];
777

    
778
    while (data_size) {
779
        int duration = ass_get_duration(data);
780
        max_duration = FFMAX(duration, max_duration);
781
        end = memchr(data, '\n', data_size);
782
        size = line_size = end ? end-data+1 : data_size;
783
        size -= end ? (end[-1]=='\r')+1 : 0;
784
        start = data;
785
        for (i=0; i<3; i++, start++)
786
            if (!(start = memchr(start, ',', size-(start-data))))
787
                return max_duration;
788
        size -= start - data;
789
        sscanf(data, "Dialogue: %d,", &layer);
790
        i = snprintf(buffer, sizeof(buffer), "%"PRId64",%d,",
791
                     s->streams[pkt->stream_index]->nb_frames++, layer);
792
        size = FFMIN(i+size, sizeof(buffer));
793
        memcpy(buffer+i, start, size-i);
794

    
795
        av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
796
               "pts %" PRId64 ", duration %d\n",
797
               url_ftell(pb), size, pkt->pts, duration);
798
        blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(size));
799
        put_ebml_id(pb, MATROSKA_ID_BLOCK);
800
        put_ebml_num(pb, size+4, 0);
801
        put_byte(pb, 0x80 | (pkt->stream_index + 1));     // this assumes stream_index is less than 126
802
        put_be16(pb, pkt->pts - mkv->cluster_pts);
803
        put_byte(pb, 0);
804
        put_buffer(pb, buffer, size);
805
        put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
806
        end_ebml_master(pb, blockgroup);
807

    
808
        data += line_size;
809
        data_size -= line_size;
810
    }
811

    
812
    return max_duration;
813
}
814

    
815
static void mkv_write_block(AVFormatContext *s, unsigned int blockid, AVPacket *pkt, int flags)
816
{
817
    MatroskaMuxContext *mkv = s->priv_data;
818
    ByteIOContext *pb = s->pb;
819
    AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
820
    uint8_t *data = NULL;
821
    int size = pkt->size;
822

    
823
    av_log(s, AV_LOG_DEBUG, "Writing block at offset %" PRIu64 ", size %d, "
824
           "pts %" PRId64 ", dts %" PRId64 ", duration %d, flags %d\n",
825
           url_ftell(pb), pkt->size, pkt->pts, pkt->dts, pkt->duration, flags);
826
    if (codec->codec_id == CODEC_ID_H264 && codec->extradata_size > 0 &&
827
        (AV_RB24(codec->extradata) == 1 || AV_RB32(codec->extradata) == 1))
828
        ff_avc_parse_nal_units_buf(pkt->data, &data, &size);
829
    else
830
        data = pkt->data;
831
    put_ebml_id(pb, blockid);
832
    put_ebml_num(pb, size+4, 0);
833
    put_byte(pb, 0x80 | (pkt->stream_index + 1));     // this assumes stream_index is less than 126
834
    put_be16(pb, pkt->pts - mkv->cluster_pts);
835
    put_byte(pb, flags);
836
    put_buffer(pb, data, size);
837
    if (data != pkt->data)
838
        av_free(data);
839
}
840

    
841
static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
842
{
843
    MatroskaMuxContext *mkv = s->priv_data;
844
    ByteIOContext *pb = s->pb;
845
    AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
846
    int keyframe = !!(pkt->flags & PKT_FLAG_KEY);
847
    int duration = pkt->duration;
848
    int ret;
849

    
850
    // start a new cluster every 5 MB or 5 sec
851
    if (url_ftell(pb) > mkv->cluster_pos + 5*1024*1024 || pkt->pts > mkv->cluster_pts + 5000) {
852
        av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
853
               " bytes, pts %" PRIu64 "\n", url_ftell(pb), pkt->pts);
854
        end_ebml_master(pb, mkv->cluster);
855

    
856
        ret = mkv_add_seekhead_entry(mkv->cluster_seekhead, MATROSKA_ID_CLUSTER, url_ftell(pb));
857
        if (ret < 0) return ret;
858

    
859
        mkv->cluster_pos = url_ftell(pb);
860
        mkv->cluster = start_ebml_master(pb, MATROSKA_ID_CLUSTER, 0);
861
        put_ebml_uint(pb, MATROSKA_ID_CLUSTERTIMECODE, pkt->pts);
862
        mkv->cluster_pts = pkt->pts;
863
        av_md5_update(mkv->md5_ctx, pkt->data, FFMIN(200, pkt->size));
864
    }
865

    
866
    if (codec->codec_type != CODEC_TYPE_SUBTITLE) {
867
        mkv_write_block(s, MATROSKA_ID_SIMPLEBLOCK, pkt, keyframe << 7);
868
    } else if (codec->codec_id == CODEC_ID_SSA) {
869
        duration = mkv_write_ass_blocks(s, pkt);
870
    } else {
871
        ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
872
        duration = pkt->convergence_duration;
873
        mkv_write_block(s, MATROSKA_ID_BLOCK, pkt, 0);
874
        put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
875
        end_ebml_master(pb, blockgroup);
876
    }
877

    
878
    if (codec->codec_type == CODEC_TYPE_VIDEO && keyframe) {
879
        ret = mkv_add_cuepoint(mkv->cues, pkt, mkv->cluster_pos);
880
        if (ret < 0) return ret;
881
    }
882

    
883
    mkv->duration = FFMAX(mkv->duration, pkt->pts + duration);
884
    return 0;
885
}
886

    
887
static int mkv_write_trailer(AVFormatContext *s)
888
{
889
    MatroskaMuxContext *mkv = s->priv_data;
890
    ByteIOContext *pb = s->pb;
891
    int64_t currentpos, second_seekhead, cuespos;
892
    int ret;
893

    
894
    end_ebml_master(pb, mkv->cluster);
895

    
896
    if (!url_is_streamed(pb)) {
897
        cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
898
        second_seekhead = mkv_write_seekhead(pb, mkv->cluster_seekhead);
899

    
900
        ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES    , cuespos);
901
        if (ret < 0) return ret;
902
        ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_SEEKHEAD, second_seekhead);
903
        if (ret < 0) return ret;
904
        mkv_write_seekhead(pb, mkv->main_seekhead);
905

    
906
        // update the duration
907
        av_log(s, AV_LOG_DEBUG, "end duration = %" PRIu64 "\n", mkv->duration);
908
        currentpos = url_ftell(pb);
909
        url_fseek(pb, mkv->duration_offset, SEEK_SET);
910
        put_ebml_float(pb, MATROSKA_ID_DURATION, mkv->duration);
911

    
912
        // write the md5sum of some frames as the segment UID
913
        if (!(s->streams[0]->codec->flags & CODEC_FLAG_BITEXACT)) {
914
            uint8_t segment_uid[16];
915
            av_md5_final(mkv->md5_ctx, segment_uid);
916
            url_fseek(pb, mkv->segment_uid, SEEK_SET);
917
            put_ebml_binary(pb, MATROSKA_ID_SEGMENTUID, segment_uid, 16);
918
        }
919
        url_fseek(pb, currentpos, SEEK_SET);
920
    }
921

    
922
    end_ebml_master(pb, mkv->segment);
923
    av_free(mkv->md5_ctx);
924
    put_flush_packet(pb);
925
    return 0;
926
}
927

    
928
AVOutputFormat matroska_muxer = {
929
    "matroska",
930
    NULL_IF_CONFIG_SMALL("Matroska file format"),
931
    "video/x-matroska",
932
    "mkv",
933
    sizeof(MatroskaMuxContext),
934
    CODEC_ID_MP2,
935
    CODEC_ID_MPEG4,
936
    mkv_write_header,
937
    mkv_write_packet,
938
    mkv_write_trailer,
939
    .flags = AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
940
    .codec_tag = (const AVCodecTag* const []){ff_codec_bmp_tags, ff_codec_wav_tags, 0},
941
    .subtitle_codec = CODEC_ID_TEXT,
942
};
943

    
944
AVOutputFormat matroska_audio_muxer = {
945
    "matroska",
946
    NULL_IF_CONFIG_SMALL("Matroska file format"),
947
    "audio/x-matroska",
948
    "mka",
949
    sizeof(MatroskaMuxContext),
950
    CODEC_ID_MP2,
951
    CODEC_ID_NONE,
952
    mkv_write_header,
953
    mkv_write_packet,
954
    mkv_write_trailer,
955
    .flags = AVFMT_GLOBALHEADER,
956
    .codec_tag = (const AVCodecTag* const []){ff_codec_wav_tags, 0},
957
};